java代码实现http发起post请求

当然，这里是一个Java代码示例，用于发起HTTP POST请求：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpPostRequestExample {
    public static void main(String[] args) throws Exception {
        
        // 定义POST请求的URL
        String url = "http://example.com/api/endpoint";
        
        // 创建URL对象
        URL obj = new URL(url);
        
        // 创建HttpURLConnection对象
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        
        // 设置请求方法为POST
        con.setRequestMethod("POST");
        
        // 设置请求头部信息
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        con.setRequestProperty("Content-Type", "application/json");
        
        // 设置可写入请求内容
        con.setDoOutput(true);
        
        // 构建请求体
        String requestBody = "{\"key1\":\"value1\",\"key2\":\"value2\"}";
        
        // 获取输出流并写入请求体
        OutputStream outputStream = con.getOutputStream();
        outputStream.write(requestBody.getBytes());
        outputStream.flush();
        outputStream.close();
        
        // 获取请求响应码
        int responseCode = con.getResponseCode();
        System.out.println("Response Code : " + responseCode);
        
        // 读取响应内容
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuilder response = new StringBuilder();
        
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        
        in.close();
        
        // 打印响应结果
        System.out.println("Response : " + response.toString());
    }
}

请注意，上述代码中的URL和请求头部信息是示例值，你需要根据实际情况进行修改。此外，你还可以根据需要修改请求体内容。